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Crystal structure and composition of hiärneite, Ca2Zr4Mn3+SbTiO16, and constitution of the calzirtite group
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0003-2109-2277
University of Florence.ORCID iD: 0000-0003-1168-7306
2022 (English)In: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 86, no 2, p. 314-318Article in journal (Refereed) Published
Abstract [en]

The crystal structure of hiärneite has been refined from single-crystal X-ray diffraction data (λ = 0.71073 Å) on type material from Långban, Värmland, Sweden. The refinement converged to R1 = 0.046 based on 1073 reflections with F2 > 4σ(F2). The tetragonal unit cell, space group I41/acd, has the parameters a = 15.2344(6) Å and c = 10.0891(6) Å with Z = 8. The mineral is isostructural with calzirtite, ideally Ca2Zr5Ti2O16, with a structural topology derived from fluorite. In hiärneite, Mn3+ is ordered at a 4- to 8-fold coordinated site (with a distorted polyhedral coordination figure), without the atom splitting encountered at the corresponding Zr-dominated site of calzirtite. The end-member formula for hiärneite is established as Ca2Zr4Mn3+SbTiO16. The calzirtite group, with calzirtite, hiärneite and tazheranite (cubic ZrO2-x), has been approved by the IMA–CNMNC.

Place, publisher, year, edition, pages
2022. Vol. 86, no 2, p. 314-318
Keywords [sv]
hiärneit, kristallstruktur, calzirtitgruppen, tazheranit, mineralnomenklatur, Långban
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4865DOI: 10.1180/mgm.2022.19OAI: oai:DiVA.org:nrm-4865DiVA, id: diva2:1713792
Available from: 2022-11-28 Created: 2022-11-28 Last updated: 2022-11-28Bibliographically approved

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